I can't connect to the Internet!

[XBear]

When I sign in to my Xfinity account on my MacBook Pro, the WiFi icon on the top of my screen indicates that I'm connected. But I can't access any websites.

There are five white lights on the front of my modem. The top light - Power - shines steadily. The middle light - "Online" - does nothing. The other lights flash on and off.

I found the following under Network Preferences:

Network Preferences > 802.1X
Name: WiFi
Authentication: TTSL
Wireless Network: XFINITY
Security Type: WPA/WPA2 Enterprise
Trusted Certificate:
Trusted Servers: *.aaa.wifi.comcast.com,

If I remember correctly, the first time I tried to connect all the lights shone steadily except for Online, but I could be mistaken.

Another problem - Xfinity advertised two months of free service due to the coronavirus pandemic. So I signed up and had an Internet connection. But after setting up my modem, I've apparently lost my free connection, which means I can't connect to the Internet, period.

I've given up on customer support. I decided to try the forum, after which I'm cancelling my account.

Thanks for any tips.

[EG]

Start here;

https://forums.xfinity.com/t5/Your-Home-Network/Internet-Troubleshooting-Tips/m-p/3310447#M316652

[XBear]

Thanks for the link. I'm at a WiFi cafe right now (I didn't know they were going to reopen today!), but I'll check out your reference when I get home.